A high-severity flaw (CVE-2026-31431, CVSS 7.8) in the Linux kernel's algif_aead module, known as Copy Fail, allows a local attacker to perform privilege escalation or container escape via improper handling of in-place cryptographic operations. The vulnerability affects Linux kernel versions from 4.14 through multiple branches up to specific cutoffs, including versions 5.10 prior to 5.10.254, 5.15 prior to 5.15.204, 6.1 prior to 6.1.170, 6.6 prior to 6.6.137, 6.12 prior to 6.12.85, and 6.18 prior to 6.18.22. Remediation requires upgrading to the respective fixed kernel versions listed for each affected branch.
It was discovered that the Linux kernel algif_aead module did not properly handle in-place cryptographic operations. This flaw is known as Copy Fail. A local attacker could use this to escalate privileges, or possibly escape a container. (CVE-2026-31431) Several security issues were discovered in the Linux kernel. An attacker could possibly use these to compromise the system. This update corrects flaws in the following subsystems: - Cryptographic API; - Ethernet bonding driver; - SMB network file system; - Netfilter; - io_uring subsystem; - Packet sockets; - TLS protocol; (CVE-2024-35862, CVE-2024-50060, CVE-2026-23274, CVE-2026-23351, CVE-2026-31419, CVE-2026-31504, CVE-2026-31533, CVE-2026-43033, CVE-2026-43077, CVE-2026-43078)